Как создать стенку, через которую нельзя пройти?

  procedure TForm1.FormKeyPress(Sender: TObject; var Key: char);
  begin
    case Key of
    'w': Shape1.Top := Shape1.Top - 3;
    's': Shape1.Top := Shape1.Top + 3;
    'a': Shape1.Left := Shape1.Left - 3;
    'd': Shape1.Left := Shape1.Left + 3;
    end;
  end;

procedure TForm1.FormKeyPress(Sender: TObject; var Key: char);
var r1,r2,r3:TRect;
begin
 r1:=Shape1.BoundsRect;
 r2:=Shape2.BoundsRect;
   case Key of
    '1': if not IntersectRect(r3,r1,r2) then Shape1.Top := Shape1.Top - 3 ;
    '2': if not IntersectRect(r3,r1,r2) then Shape1.Top := Shape1.Top + 3;
    '3': if not IntersectRect(r3,r1,r2) then Shape1.Left := Shape1.Left - 3;
    '4': if not IntersectRect(r3,r2,r1) then Shape1.Left := Shape1.Left + 3;
    end;
end;

unit Unit1;
 
{$mode objfpc}{$H+}
 
interface
 
uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls,
  StdCtrls,Types;
 
type
 
  { TForm1 }
 
  TForm1 = class(TForm)
    Shape1: TShape;
    Shape2: TShape;
    procedure FormCreate(Sender: TObject);
    procedure FormKeyPress(Sender: TObject; var Key: char);
  private
 
  public
 
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.lfm}
 
{ TForm1 }
 
 
procedure TForm1.FormCreate(Sender: TObject);
begin
 keypreview:=true;
end;
 
procedure TForm1.FormKeyPress(Sender: TObject; var Key: char);
var r1,r2,r3:TRect;
begin
 r1:=Shape1.BoundsRect;
 r2:=Shape2.BoundsRect;
   case Key of
    '1': Shape1.Top := Shape1.Top - 3 ;
    '2': Shape1.Top := Shape1.Top + 3;
    '3': if not IntersectRect(r3,r1,r2) then Shape1.Left := Shape1.Left - 3;
    '4': if not IntersectRect(r3,r2,r1) then Shape1.Left := Shape1.Left + 3;
    end;
end;
 
end.